I met Tom Burney from Swift Cycleworks here in Portland a few months ago and after testing his electric bike with the automatic CVT, I have to say it is the best electric bike I have ever tried.
www.swiftcycleworks.com
I used to own an Optibike 850R, so I have a pretty good standard to compare to.
https://www.youtube.com/watch?v=xt0RUooD0-A
It performs just like the Optibike, but runs much quieter and shifts much more smoothly with about the same weight, but at a fraction of the cost. 

I am a big fan of the belt drive since I purchased a Bike Friday Silk a few years ago:
https://www.bikefriday.com/bicycles/touring/1445

Isaac
-------- Original Message --------
Subject: [dorkbotpdx-blabber] Electric bike conversion
From: Pavel Kirkovsky <[email protected]>
Date: Mon, August 25, 2014 3:35 pm
To: DorkbotPDX <[email protected]>

Hi all,
I know there are several e-bike experts here! After reading about custom electric bicycles that use the NuVinci CVT hub, I became interested in figuring out what it would take to convert my bike to have an electric assist feature.
The bike is a classic Dutch "Omafiets" made by Workcycles, and it already has a N360 CVT hub. This bike is super comfortable already, but it would be even better with electric assist and a trailer for extra cargo capacity.
My goal is to have a versatile comfortable bombproof bike that can be used to fetch groceries or, if needed, haul heavy things on a trailer.

Could anyone help point me in the right direction?

Thanks,
Pavel

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